Labeled by prosecutors as a “monster” who deserves “the ultimate penalty,” convicted murderer Blaine Keith Milam was sentenced late Thursday night to die by lethal injection for his role in the beating death of his girlfriend’s daughter.

Milam, 20, was convicted of capital murder May 17 for killing 13-month-old Amora Carson, the daughter of his girlfriend, Jessica Carson.

Chronic use of methamphetamine by Blaine Keith Milam may have played a factor in his actions leading to the death of 13-month-old Amora Bain Carson, a psychology professor testified Monday.

During the sentencing phase of Milam’s capital murder trial, Paula Lundberg-Love, an expert in psychopharmacology and professor at the University of Texas at Tyler, explained the effects drug use has on the brain and behavior, including “believing there were demons and that demons were changing the facial structure of the child,” she said.

During Friday’s proceedings, the defense had Dr. Patricia Rosen, a toxicology expert, testify about the effects methamphetamines have on a person and to describe the levels found in Milam after he was taken into custody in 2008.

Dr. Rosen said a user of methamphetamine at the levels Milam had in his systems could experience hallucinations and other delusions.

Postpartum psychosis with delusions, including demonic possession with the ability to talk to the dead, is how a psychiatrist described the mental health of Jesseca Carson when her 13-month-old daughter Amora was brutally beaten and strangled to death in December 2008.

The psychiatrist testified in Blaine Milam’s capital murder trial Wednesday in a Montgomery County courtroom as Milam’s defense team attempted to shift the blame of the death from their client to Ms. Carson.

Blaine Milam and Jesseca Carson stand accused of murdering her 13-month-old daughter, Amo­ra, on Dec. 2, 2008, by beating the child to death while performing what they claim was an exorcism to drive out demons from the toddler.